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show.c revision 1.42.2.1 
      1 /*	$NetBSD: show.c,v 1.42.2.1 2011/02/08 16:19:06 bouyer Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1988, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "from: @(#)route.c	8.3 (Berkeley) 3/9/94";
     36 #else
     37 __RCSID("$NetBSD: show.c,v 1.42.2.1 2011/02/08 16:19:06 bouyer Exp $");
     38 #endif
     39 #endif /* not lint */
     40 
     41 #include <sys/param.h>
     42 #include <sys/protosw.h>
     43 #include <sys/socket.h>
     44 #include <sys/mbuf.h>
     45 
     46 #include <arpa/inet.h>
     47 #include <net/if.h>
     48 #include <net/if_dl.h>
     49 #include <net/if_types.h>
     50 #include <net/route.h>
     51 #include <netinet/in.h>
     52 #include <netmpls/mpls.h>
     53 
     54 #include <sys/sysctl.h>
     55 
     56 #include <netdb.h>
     57 #include <stdbool.h>
     58 #include <stdio.h>
     59 #include <stdlib.h>
     60 #include <string.h>
     61 #include <unistd.h>
     62 #include <err.h>
     63 
     64 #include "keywords.h"
     65 #include "extern.h"
     66 #include "prog_ops.h"
     67 
     68 
     69 /*
     70  * Definitions for showing gateway flags.
     71  */
     72 struct bits {
     73 	short	b_mask;
     74 	char	b_val;
     75 };
     76 static const struct bits bits[] = {
     77 	{ RTF_UP,	'U' },
     78 	{ RTF_GATEWAY,	'G' },
     79 	{ RTF_HOST,	'H' },
     80 	{ RTF_REJECT,	'R' },
     81 	{ RTF_DYNAMIC,	'D' },
     82 	{ RTF_MODIFIED,	'M' },
     83 	{ RTF_DONE,	'd' }, /* Completed -- for routing messages only */
     84 	{ RTF_MASK,	'm' }, /* Mask Present -- for routing messages only */
     85 	{ RTF_CLONING,	'C' },
     86 	{ RTF_XRESOLVE,	'X' },
     87 	{ RTF_LLINFO,	'L' },
     88 	{ RTF_STATIC,	'S' },
     89 	{ RTF_BLACKHOLE, 'B' },
     90 	{ RTF_CLONED,	'c' },
     91 	{ RTF_PROTO1,	'1' },
     92 	{ RTF_PROTO2,	'2' },
     93 	{ 0, '\0' }
     94 };
     95 
     96 static void pr_rthdr(int);
     97 static void p_rtentry(struct rt_msghdr *);
     98 static void pr_family(int);
     99 static void p_sockaddr(struct sockaddr *, struct sockaddr *, int, int );
    100 static void p_flags(int);
    101 
    102 void
    103 parse_show_opts(int argc, char * const *argv, int *afp, int *flagsp,
    104     const char **afnamep, bool nolink)
    105 {
    106 	const char *afname = "unspec";
    107 	int af, flags;
    108 
    109 	flags = 0;
    110 	af = AF_UNSPEC;
    111 	for (; argc >= 2; argc--) {
    112 		if (*argv[argc - 1] != '-')
    113 			goto bad;
    114 		switch (keyword(argv[argc - 1] + 1)) {
    115 		case K_HOST:
    116 			flags |= RTF_HOST;
    117 			break;
    118 		case K_LLINFO:
    119 			flags |= RTF_LLINFO;
    120 			break;
    121 		case K_INET:
    122 			af = AF_INET;
    123 			afname = argv[argc - 1] + 1;
    124 			break;
    125 #ifdef INET6
    126 		case K_INET6:
    127 			af = AF_INET6;
    128 			afname = argv[argc - 1] + 1;
    129 			break;
    130 #endif
    131 #ifndef SMALL
    132 		case K_ATALK:
    133 			af = AF_APPLETALK;
    134 			afname = argv[argc - 1] + 1;
    135 			break;
    136 		case K_ISO:
    137 		case K_OSI:
    138 			af = AF_ISO;
    139 			afname = argv[argc - 1] + 1;
    140 			break;
    141 		case K_MPLS:
    142 			af = AF_MPLS;
    143 			afname = argv[argc - 1] + 1;
    144 			break;
    145 #endif /* SMALL */
    146 		case K_LINK:
    147 			if (nolink)
    148 				goto bad;
    149 			af = AF_LINK;
    150 			afname = argv[argc - 1] + 1;
    151 			break;
    152 		default:
    153 			goto bad;
    154 		}
    155 	}
    156 	switch (argc) {
    157 	case 1:
    158 	case 0:
    159 		break;
    160 	default:
    161 	bad:
    162 		usage(argv[argc - 1]);
    163 	}
    164 	if (afnamep != NULL)
    165 		*afnamep = afname;
    166 	*afp = af;
    167 	*flagsp = flags;
    168 }
    169 
    170 /*
    171  * Print routing tables.
    172  */
    173 void
    174 show(int argc, char *const *argv)
    175 {
    176 	size_t needed;
    177 	int af, flags, mib[6];
    178 	char *buf, *next, *lim;
    179 	struct rt_msghdr *rtm;
    180 	struct sockaddr *sa;
    181 
    182 	parse_show_opts(argc, argv, &af, &flags, NULL, true);
    183 	mib[0] = CTL_NET;
    184 	mib[1] = PF_ROUTE;
    185 	mib[2] = 0;
    186 	mib[3] = 0;
    187 	mib[4] = NET_RT_DUMP;
    188 	mib[5] = 0;
    189 	if (prog_sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
    190 		err(EXIT_FAILURE, "route-sysctl-estimate");
    191 	buf = lim = NULL;
    192 	if (needed) {
    193 		if ((buf = malloc(needed)) == 0)
    194 			err(EXIT_FAILURE, "malloc");
    195 		if (prog_sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
    196 			err(EXIT_FAILURE, "sysctl of routing table");
    197 		lim  = buf + needed;
    198 	}
    199 
    200 	printf("Routing table%s\n", (af == AF_UNSPEC)? "s" : "");
    201 
    202 	if (needed) {
    203 		for (next = buf; next < lim; next += rtm->rtm_msglen) {
    204 			rtm = (struct rt_msghdr *)next;
    205 			sa = (struct sockaddr *)(rtm + 1);
    206 			if ((rtm->rtm_flags & flags) != flags)
    207 				continue;
    208 			if (af == AF_UNSPEC || af == sa->sa_family)
    209 				p_rtentry(rtm);
    210 		}
    211 		free(buf);
    212 	}
    213 }
    214 
    215 
    216 /* column widths; each followed by one space */
    217 #ifndef INET6
    218 #define	WID_DST(af)	18	/* width of destination column */
    219 #define	WID_GW(af)	18	/* width of gateway column */
    220 #else
    221 /* width of destination/gateway column */
    222 #if 1
    223 /* strlen("fe80::aaaa:bbbb:cccc:dddd@gif0") == 30, strlen("/128") == 4 */
    224 #define	WID_DST(af)	((af) == AF_INET6 ? (nflag ? 34 : 18) : 18)
    225 #define	WID_GW(af)	((af) == AF_INET6 ? (nflag ? 30 : 18) : 18)
    226 #else
    227 /* strlen("fe80::aaaa:bbbb:cccc:dddd") == 25, strlen("/128") == 4 */
    228 #define	WID_DST(af)	((af) == AF_INET6 ? (nflag ? 29 : 18) : 18)
    229 #define	WID_GW(af)	((af) == AF_INET6 ? (nflag ? 25 : 18) : 18)
    230 #endif
    231 #endif /* INET6 */
    232 
    233 /*
    234  * Print header for routing table columns.
    235  */
    236 static void
    237 pr_rthdr(int af)
    238 {
    239 
    240 	printf("%-*.*s %-*.*s %-6.6s\n",
    241 		WID_DST(af), WID_DST(af), "Destination",
    242 		WID_GW(af), WID_GW(af), "Gateway",
    243 		"Flags");
    244 }
    245 
    246 
    247 /*
    248  * Print a routing table entry.
    249  */
    250 static void
    251 p_rtentry(struct rt_msghdr *rtm)
    252 {
    253 	struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
    254 #ifdef notdef
    255 	static int masks_done, banner_printed;
    256 #endif
    257 	static int old_af;
    258 	int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST |
    259 	    RTF_REJECT | RTF_LLINFO;
    260 
    261 #ifdef notdef
    262 	/* for the moment, netmasks are skipped over */
    263 	if (!banner_printed) {
    264 		printf("Netmasks:\n");
    265 		banner_printed = 1;
    266 	}
    267 	if (masks_done == 0) {
    268 		if (rtm->rtm_addrs != RTA_DST ) {
    269 			masks_done = 1;
    270 			af = sa->sa_family;
    271 		}
    272 	} else
    273 #endif
    274 		af = sa->sa_family;
    275 	if (old_af != af) {
    276 		old_af = af;
    277 		pr_family(af);
    278 		pr_rthdr(af);
    279 	}
    280 	if (rtm->rtm_addrs == RTA_DST)
    281 		p_sockaddr(sa, NULL, 0, WID_DST(af) + 1 + WID_GW(af) + 1);
    282 	else {
    283 		struct sockaddr *nm;
    284 
    285 		if ((rtm->rtm_addrs & RTA_NETMASK) == 0)
    286 			nm = NULL;
    287 		else {
    288 			/* skip to gateway */
    289 			nm = (struct sockaddr *)
    290 			    (RT_ROUNDUP(sa->sa_len) + (char *)sa);
    291 			/* skip over gateway to netmask */
    292 			nm = (struct sockaddr *)
    293 			    (RT_ROUNDUP(nm->sa_len) + (char *)nm);
    294 		}
    295 
    296 		p_sockaddr(sa, nm, rtm->rtm_flags, WID_DST(af));
    297 		sa = (struct sockaddr *)(RT_ROUNDUP(sa->sa_len) + (char *)sa);
    298 		p_sockaddr(sa, NULL, 0, WID_GW(af));
    299 	}
    300 	p_flags(rtm->rtm_flags & interesting);
    301 	putchar('\n');
    302 }
    303 
    304 
    305 /*
    306  * Print address family header before a section of the routing table.
    307  */
    308 static void
    309 pr_family(int af)
    310 {
    311 	const char *afname;
    312 
    313 	switch (af) {
    314 	case AF_INET:
    315 		afname = "Internet";
    316 		break;
    317 #ifdef INET6
    318 	case AF_INET6:
    319 		afname = "Internet6";
    320 		break;
    321 #endif /* INET6 */
    322 #ifndef SMALL
    323 	case AF_ISO:
    324 		afname = "ISO";
    325 		break;
    326 	case AF_MPLS:
    327 		afname = "MPLS";
    328 		break;
    329 #endif /* SMALL */
    330 	case AF_APPLETALK:
    331 		afname = "AppleTalk";
    332 		break;
    333 	default:
    334 		afname = NULL;
    335 		break;
    336 	}
    337 	if (afname)
    338 		printf("\n%s:\n", afname);
    339 	else
    340 		printf("\nProtocol Family %d:\n", af);
    341 }
    342 
    343 
    344 static void
    345 p_sockaddr(struct sockaddr *sa, struct sockaddr *nm, int flags, int width)
    346 {
    347 	char workbuf[128];
    348 	const char *cp;
    349 
    350 	switch(sa->sa_family) {
    351 
    352 	case AF_LINK:
    353 		if (getnameinfo(sa, sa->sa_len, workbuf, sizeof(workbuf),
    354 		    NULL, 0, NI_NUMERICHOST) != 0)
    355 			strlcpy(workbuf, "invalid", sizeof(workbuf));
    356 		cp = workbuf;
    357 		break;
    358 
    359 	case AF_INET:
    360 		cp = routename(sa, nm, flags);
    361 		break;
    362 
    363 #ifdef INET6
    364 	case AF_INET6:
    365 		cp = routename(sa, nm, flags);
    366 		/* make sure numeric address is not truncated */
    367 		if (strchr(cp, ':') != NULL && (int)strlen(cp) > width)
    368 			width = strlen(cp);
    369 		break;
    370 #endif /* INET6 */
    371 
    372 #ifndef SMALL
    373 	case AF_MPLS:
    374 		{
    375 		struct sockaddr_mpls *smpls = (struct sockaddr_mpls *)sa;
    376 		union mpls_shim ms;
    377 
    378 		ms.s_addr = ntohl(smpls->smpls_addr.s_addr);
    379 
    380 		snprintf(workbuf, sizeof(workbuf), "%u",
    381 			ms.shim.label);
    382 		cp = workbuf;
    383 		}
    384 		break;
    385 	case AF_APPLETALK:
    386 		if (getnameinfo(sa, sa->sa_len, workbuf, sizeof(workbuf),
    387 		    NULL, 0, NI_NUMERICHOST) != 0)
    388 			strlcpy(workbuf, "invalid", sizeof(workbuf));
    389 		cp = workbuf;
    390 		break;
    391 
    392 #endif /* SMALL */
    393 
    394 	default:
    395 	    {
    396 		u_char *s = (u_char *)sa->sa_data, *slim;
    397 		char *wp = workbuf, *wplim;
    398 
    399 		slim = sa->sa_len + (u_char *)sa;
    400 		wplim = wp + sizeof(workbuf) - 6;
    401 		wp += snprintf(wp, wplim - wp, "(%d)", sa->sa_family);
    402 		while (s < slim && wp < wplim) {
    403 			wp += snprintf(wp, wplim - wp, " %02x", *s++);
    404 			if (s < slim)
    405 			    wp += snprintf(wp, wplim - wp, "%02x", *s++);
    406 		}
    407 		cp = workbuf;
    408 	    }
    409 	}
    410 	if (width < 0 )
    411 		printf("%s ", cp);
    412 	else {
    413 		if (nflag)
    414 			printf("%-*s ", width, cp);
    415 		else
    416 			printf("%-*.*s ", width, width, cp);
    417 	}
    418 }
    419 
    420 static void
    421 p_flags(int f)
    422 {
    423 	char name[33], *flags;
    424 	const struct bits *p = bits;
    425 
    426 	for (flags = name; p->b_mask; p++)
    427 		if (p->b_mask & f)
    428 			*flags++ = p->b_val;
    429 		else if (Sflag)
    430 			*flags++ = ' ';
    431 	*flags = '\0';
    432 	printf("%-6.6s ", name);
    433 }
    434 
    435